| Sumario: | Reaction time (RT), thought to be important for acquiring a full understanding of the establishment of equivalence classes, has been reported in a number of studies within the area of stimulus equivalence research. In this study, we trained 3 classes of potentially 3 members, with arbitrary stimuli in a one-to-many training structure in 5 adult participants, using a touch screen and software-based recordings. After training the conditional relations, a limited hold (LH) was calculated for each of the 5 participants based on actual RT. Training with a titrating LH in 100-ms steps was conducted until all the participants responded within 1.2 s. Finally, programmed consequences were thinned before testing. We arranged an LH of 2.5 s during the testing for emergent relations. 1 of the 5 participants was found to demonstrate stimulus equivalence. The pattern of increasing RT from baseline trials to symmetry and equivalence test trials was not found.
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